Access Mosquitto MQTT via Nginx

I did a droplet with Nginx, Node-red, and Mosquitto because I want to send MQTT message from a RaspberryPi to the droplet. I adjusted the Nginx based on this page: I configured Mosquitto as the DO tutorial was supposed. Nevertheless, I cannot reach the Mosquitto from my RaspberryPi. What can I do in order to send messages from RaspberryPi to the droplet?

Thanks for your help!

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